Hong Kong -LRB- CNN -RRB- -- A volcanic eruption in Indonesia that has displaced more than 22,000 people is intensifying , local authorities say .

Mount Sinabung , which began spewing gas in September after a three-year slumber , has erupted over 220 times this week .

The hot ashes and smoke have caused pyroclastic flows -- a fast-moving mass of gas and rocks -- to stretch to seven kilometers down the southeast slope of the 2,600 meter -LRB- 8,530 foot -RRB- mountain in North Sumatra . Last week , flows reached three kilometers .

The local government is still able to cope with the disaster , and no casualties have been reported according to Sutopo Purwo Nugroho , spokesman for Indonesia 's national agency for disaster management .

The government has evacuated more than 22,000 people to 34 temporary camps .

However one area , housing at least 1,000 residents , still lacks necessary provisions and shelter .

The displaced say they have urgent need for baby formula , clean water and gas , said local aid coordinator in Jambur Siabang-abang .

A national emergency has n't been declared , but the government is prepared for the `` worst case scenario . ''

In case of bigger eruptions , the danger zone would be extended to a radius of 10 kilometers from 5 to 7 kilometers currently .

If the zone is enlarged , Nugroho estimates that 59,000 people would have to be evacuated .

Kathy Quiano in Jakarta , Indonesia contributed to this report .

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A volcanic eruption in Indonesia is intensifying

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More than 22,000 people have been evacuated from Mount Sinabung area

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No casualties have been reported

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Authorities considering expanding `` danger zone '' if eruptions get bigger